Volume 103, Number 4, August 2013
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 September 2013|
Pre-melting of crossing vortex lattices
1 Miamed GmbH - Köln, Germany
2 Weizmann Institute of Science - Rehovot 76100, Israel
3 Institut für Theoretische Physik, Universität zu Köln - Köln, Germany
Received: 21 June 2013
Accepted: 6 August 2013
The pre-melting of high vortex density planes observed recently in layered superconductors in tilted magnetic field (Segev Y. et al., Phys. Rev. Lett., 107 (2011) 247001) is explained theoretically. Based on the structural information of the crossing lattices of pancake and Josephson vortices the effective vortex cage potential at different lattice sites is determined numerically. Melting takes place when the thermal energy allows proliferation of vacancy-interstitial pairs. It is found that the increased density of pancake vortex stacks in the planes containing Josephson vortices, rather than their incommensurate structure, is the main cause for pre-melting.
PACS: 74.25.Uv – Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses) / 74.25.Op – Mixed states, critical fields, and surface sheaths / 74.25.Dw – Superconductivity phase diagrams
© EPLA, 2013
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